/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/Operations/SplitAttributeWelder.h
Welds split UVs shared by the ParentVID vertex in the ParentMesh.
static void WeldSplitUVs ( const int32 ParentVID, [FDynamicMeshUVOverlay](API\Runtime\GeometryCore\DynamicMesh\TDynamicMeshVectorOverlay) & UVOverlay, float UVDistSqrdThreshold )